the connection went from good to dead within a few seconds (assuming SQL was successfully emitted on the previous checkout). Your database was restarted or a network failure occurred.
Kamil Gorlo wrote: > > Hi, > > I know this problem shows on group from time to time, but suggested > solutions does not work for me (pool_recycle). Here is my situation: > > 1. I am using SQLAlchemy 0.4.7p1-2 from Pylons 0.9.6.2-2 on Debian > Lenny (xen-amd64) > 2. From time to time I see in logs: "MySQL has gone away" and this is > reason why some of HTTP requests made to my Pylons app fail. > 3. My settings in configuration file are as follows: > >>>> > ... > sqlalchemy.url = mysql://USER:p...@host:3306/DBNAME?charset=utf8 > sqlalchemy.pool_recycle = 60 #(wait_timeout on MySQL side is default, > which is 8 hours AFAIK) > sqlalchemy.convert_unicode = True > ... > <<< > > 4. I have logging enabled, and here is what I see when request fail > (please look at connection identified as "at 2238cd0", its lifetime is > one minute but it looks that in very last moment (the same second > which it should be destroyed) this connection is returned from pool, > possibly because of some http request - unfortunately after that we > can see that error occurs). Also what is surprise for me why is whole > pool recreating after this? > > P.S. Third column is thread id. > >>>> > 16:19:07,621 INFO 1115703632 [sqlalchemy.pool.QueuePool.0x..10] > Closing connection <_mysql.connection open to 'DB_HOST' at 2262480> > 16:19:07,624 INFO 1115703632 [sqlalchemy.pool.QueuePool.0x..10] > Created new connection <_mysql.connection open to 'DB_HOST' at > 2238cd0> > 16:19:07,624 INFO 1115703632 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 2238cd0> checked > out from pool > 16:19:07,740 INFO 1115703632 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 2238cd0> being > returned to pool > 16:20:02,291 INFO 1107310928 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 2364540> checked > out from pool > 16:20:02,413 INFO 1107310928 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 2364540> being > returned to pool > 16:20:03,477 INFO 1132489040 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 222afb0> checked > out from pool > 16:20:03,516 INFO 1132489040 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 222afb0> being > returned to pool > 16:20:07,573 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Connection <_mysql.connection open to 'DB_HOST' at 2238cd0> checked > out from pool > 16:20:07,574 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Invalidate connection <_mysql.connection open to 'DB_HOST' at 2238cd0> > (reason: OperationalError:(2006, 'MySQL server has gone away')) > 16:20:07,574 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Closing connection <_mysql.connection open to 'DB_HOST' at 2238cd0> > 16:20:07,574 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Connection None being returned to pool > 16:20:07,575 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Closing connection <_mysql.connection open to 'DB_HOST' at 2364540> > 16:20:07,575 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] > Closing connection <_mysql.connection open to 'DB_HOST' at 222afb0> > 16:20:07,575 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] Pool > disposed. Pool size: 5 Connections in pool: 0 Current Overflow: -5 > Current Checked out connections: 0 > 16:20:07,575 INFO 1124096336 [sqlalchemy.pool.QueuePool.0x..10] Pool > recreating > <<< > > Any ideas? > > Thanks for your help! > > Cheers, > -- > Kamil Gorlo > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
